JPH0481719A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display device which is easily assembled without any decrease in the quantities of light of red, green, and blue due to a color filter by mounting the color filter where planar microlenses are formed of an interference film on the opposite surface from a surface in contact with a liquid crystal panel. CONSTITUTION:The color filter 6 which has the planar microlenses 5 formed on the interference film on the opposite surface from the surface in contact with the liquid crystal panel 3 is mounted. Thus, an interference interference filter is used as the color filter 6, so the quantities of light of red R, green G, and blue B are hardly decreased, so the filter needs to be positioned only once for the liquid crystal panel. Further, the interference film filter is mounted on the opposite surface of the microlenses 5 from the surface in contact with the liquid crystal panel 3, so the influence of the refraction of a light beam passing through the lenses is eliminated. Consequently, the liquid crystal display device which converges three primary colors of red R, green G, and blue B on the liquid crystal opening part 7 of the liquid crystal panel 3 efficiently without any decrease in the quantity of light can be constituted with good assembling performance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid crystal display device for increasing the amount of light from a liquid crystal aperture of a liquid crystal panel used in a liquid crystal projection television or the like.

(Prior Art) Conventionally, as shown in FIG. 9, this type of technology has proposed three
Each lens 102 of a flat microlens 103 has a large number of lenses 102 for increasing the amount of light corresponding to each liquid crystal aperture 101 in order to add the primary colors red (R), green (G), and blue (B). A device having a color filter function is known (see, for example, Japanese Patent Laid-Open No. 81-208080).

It is also known that a mosaic color filter corresponding to each pixel of a liquid crystal is provided on a separate substrate, and the liquid crystal panel, flat microlens, and color filter substrate are constructed as one unit (for example, Japanese Patent Laid-Open No. 81-20807
(See Publication No. 9).

(Problem M to be solved by the invention) In the former of the conventional techniques, since organic dyes and pigments are used in the lens 102, absorption of light is unavoidable, resulting in red (R), green ( There was a problem in that the amount of light for each of G) and blue (B) decreased.

Furthermore, the latter method has the problem that alignment work is required twice because a liquid crystal panel, a flat microlens, and a color filter substrate must be constructed corresponding to each pixel of the liquid crystal.

The present invention has been made in view of such problems with the conventional technology, and its purpose is to improve the amount of light of each of red (R), green (G), and blue (CB) using color filters. It is an object of the present invention to provide a liquid crystal display device that does not deteriorate in performance and is easy to assemble.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a planar microlens having a large number of lenses on one side of a liquid crystal panel having a large number of liquid crystal openings. A color filter formed of an interference film is attached to the surface of the flat microlens opposite to the surface in contact with the liquid crystal panel.

(Function) According to the present invention, since an interference film filter is used as a color filter, there is almost no decrease in the amount of each of red (R), green (G), and blue (B) light, and the interference film filter is directly connected to a flat plate. Since it is attached to a microlens, it only needs to be aligned once with the LCD panel.

Furthermore, since the interference film filter is attached to the surface of the flat microlens opposite to the surface in contact with the liquid crystal panel, it is not affected by the refraction of light rays after passing through the lens. That is, since light rays always enter the interference film filter almost perpendicularly, the optical characteristics of red (R), green (G), and blue (B) do not deteriorate.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a cross-sectional view of a liquid crystal display device according to the present invention, Fig. 2 is an explanatory diagram showing the arrangement of color filters, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is a perspective view of a flat microlens. It is a diagram.

As shown in FIG. 1, a liquid crystal display device consists of a liquid crystal panel 3 formed by sandwiching a liquid crystal 1 between transparent glass plates 2 and a number of lenses 4.
It is composed of a flat plate microlens 5 having a matrix of microlenses and a color filter 6 formed of an interference film.

The liquid crystal panel 3 and the flat plate microlens 5 are aligned so that the liquid crystal opening 7 corresponding to each pixel in the liquid crystal panel 3 and each lens 4 of the flat plate microlens 5 correspond one-to-one, and then adhesive 8 is applied. They are glued and fixed to each other through. Furthermore, color filters of the three primary colors, red (R), green (G), and blue (B), are provided for each lens 4 formed on the surface opposite to the surface where the flat microlens 5 contacts the liquid crystal panel 3. 6 are mounted according to a predetermined mosaic shape as shown in FIG.

As shown in FIG. 4, the flat plate microlens 5 is manufactured by using a photolithography technique to create a mask pattern having a necessary circular opening on a glass substrate 5a, and performing ion exchange through the opening. Each lens 4 is formed with a high refractive index and a three-dimensional refractive index distribution. By this method, a large number of lenses 4 arranged in a matrix can be arranged with extremely high precision.

As shown in FIG. 5, it is preferable that the flat microlenses be formed by overlapping each lens 4 so that there is no part where no lens 4 is formed on the surface of the flat microlens 5 on which the lenses 4 are formed. . Note that FIG. 5(A) is an explanatory diagram showing a plan view of the arrayed state of each lens 4 of the flat plate microlens 5, and FIG. 5(B) is an explanatory diagram showing a cross section thereof.

Further, the flat microlens 5 includes a circular recess 5b formed in a glass substrate 5a as shown in FIG. 6, and the recess 5b filled with a resin 4a having a refractive index n2 larger than the refractive index n1 of the glass substrate 5a. It can also be configured as

Alternatively, the flat microlens 5 may be constructed by forming a parallel semi-cylindrical groove 5C in the glass substrate 5a and filling the groove 50 with the resin 4a, as shown in FIG.

The red (R), green (G), and blue (B) color filters 6 are, for example, 5102-T, 0 as shown in FIG.
It is an interference film filter composed of two systems of optical multilayer films,
The mosaic shape is formed by a so-called lift-off method. For example, when forming a red (R) color filter 6R, first, a film structure with a high reflectance at the center wavelengths of 490 nm and 400 nm is used, and a high refractive index material (TiO2, refractive index n・2.3) and a low refractive index material are used. Substance (S r 02, n・1
．． 46) and are alternately stacked according to the optical film original diagram λ. As the number of laminated layers increases, the wavelength increases to 490r+m.
The reflectance of 4ΩOnm is high and the number of laminated layers is 31 and it becomes red (R
) The wavelength transmission in the vicinity of 800 nm in the region is relatively high, and the thickness of the interference film made of an optical multilayer film is 1.
A 9 μm red (R) color filter 6R is formed. On the same root, a green (G) color filter 6G has 29 layers and a thickness of 2.1 μm, and a blue (B) color filter 6B has 15 layers and a thickness of 1.1 μm. 2μm
is formed. In addition, in Figure 3, the number of laminated layers is shown in red (R) for convenience.
), 3 layers, 4 layers, and 2 layers for green (G) and f (B), respectively.
Shown as layers.

The operation of the liquid crystal display device configured as described above will be explained below.

As shown in FIG. 1, an incident light ray 10 that is almost perpendicularly incident on the flat microlens 5 from a light source system (not shown) is refracted by each lens 4 of the flat microlens 5 after passing through the respective color filters 6R and 606B. TPT (Dinghin)
(Finn Transistor) The light is focused through the liquid crystal aperture 7 surrounded by the wiring section 11.

FIG. 8 shows another embodiment, which is functionally equivalent to the liquid crystal display device shown in FIG. 1, but in which each lens 4 of the flat microlens 5 is arranged on the liquid crystal panel 3 side.

(Effects of the Invention) As explained above, according to the present invention, the three primary colors red (R), green (G), and blue (B) are displayed in the liquid crystal opening of the liquid crystal panel.
A liquid crystal display device that efficiently focuses light without reducing the amount of light can be easily assembled, and is effective in improving the image quality of liquid crystal projection televisions and the like.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a liquid crystal display device according to the present invention, Fig. 2 is an explanatory diagram showing the arrangement of color filters, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is a perspective view of a flat microlens. Figure 5 is an explanatory diagram showing the plane and cross section of the arrangement of each lens of a flat plate microlens, Figure 6 is a sectional view of a flat plate microlens whose lens portion is made of resin, and Figure 7 is an explanatory diagram showing the plane and cross section of the arrangement of each lens of a flat plate microlens. FIG. 8 is a perspective view of another embodiment, FIG. 8 is a sectional view of another embodiment of the liquid crystal display device according to the present invention, and FIG. 9 is a sectional view of a liquid crystal display device according to the prior art. 3...Liquid crystal panel, Yotsukawa lens, 5...flat plate microlens, 6...color filter, 7...liquid crystal aperture. Figure 4 Patent Applicant Nippon Sheet Glass Co., Ltd. Agent Patent Attorney 2 1) Yong-Immediate Question Patent Attorney
Kuni Ohashi Production Patent Attorney
Yu Koyama (B) Figure 5 LCD panel lens flat plate microresis color filter LCD aperture /10 and 6 Figure Figure

Claims (1)

[Claims] In a liquid crystal display device in which a flat plate microlens having a plurality of lenses is fixed to one side of a liquid crystal panel having a plurality of liquid crystal openings in correspondence with the liquid crystal openings and the lens, the flat plate microlens is connected to the liquid crystal panel. A liquid crystal display device characterized in that a color filter formed of an interference film is attached to the surface opposite to the surface in contact with the surface.